Subject: Potential Signatures of High-Energy Neutrinos Produced by Relativistic Jets in Gamma-Ray Bursts and Core-Collapse Supernove

We point out that high-energy neutrinos produced by relativistic jets can be annihilated with thermal neutrinos emitted by the associated accretion disks in gamma-ray bursts and core-collapse supernovae. For a broad range of conditions, the emerging all-flavor spectrum for neutrinos of E >∼ 0.1 PeV is modified by a factor E^(−n) with n ≈ 0.4–0.5. Flavor evolution of accretion-disk neutrinos does not affect this result but can change the emerging flavor composition of high-energy neutrinos. The above signatures provide potential tests of detailed models by IceCube.